I've been back and forth on the Helwig, that's another one I've seen where *most* people say it makes a noticeable difference, but some say it's nothing, or not much of one.
I've heard that Rams with the air suspension use a thicker/heavier bar (cause otherwise it's extra floaty) and when I checked underneath my truck, the one there honestly looks beefcake, much thicker/bigger than what I've seen people pull off their trucks when they swap in the Helwig. That being said, I haven't touched/handled it, so it could still be light/hollow. THAT being said, my truck corners better than my Grand Cherokee did (which blew my mind, just feels way more solid/planted), so I think I'm good on that for now.
Tires I'll be upgrading soon (probably Michelin Defenders, I'm 80% highway).
I've definitely been kind of flip-flopping between doing either the exhaust or the intake (first, and the other later on). The intake is cheaper and easier to install, which is why I'm currently leaning towards it. And again, I rather like the stock sound so if all changing the whole exhaust system does it make it slightly grumblier, I don't know if that's worth it.